#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "stdio_impl.h"
#include <string.h>

char *fgetln(FILE *f, size_t *plen)
{
    char *ret = 0, *z;
    ssize_t l;
    FLOCK(f);
    ungetc(getc_unlocked(f), f);
    if (f->rend && (z=memchr(f->rpos, '\n', f->rend - f->rpos))) {
        ret = (char *)f->rpos;
        *plen = ++z - ret;
        f->rpos = (void *)z;
    } else if ((l = getline(&f->getln_buf, (size_t[]){0}, f)) > 0) {
        *plen = l;
        ret = f->getln_buf;
    }
    FUNLOCK(f);
    return ret;
}
